Hm.. Are you sure this is Givenchy?
The front two studs don't look like the Givenchy logo. It does look similar to the Nightingale, though. Maybe somebody else will chime in.
^ Ah, you're right. It IS by Givenchy. It's called Givenchy Overnight Shoulder Bag. The original picture you posted seems to be the cream color one, and I think this line is from the 2008 S/S season.
Here's the studded version of the Overnight, worn by one of the Olsen twins. (Sorry I don't know which one she is, I can never tell them apart!)
^ Since it's from a past season, it may be hard to find but you can always keep searching! For right now, I see that there are none. When I googled the style name, a few came on other market sites like ioffer but that site is infamous for non-authentic goods being sold so I would stay away from that site.
I would try searching ebay from time to time and if you ever come across one, remember to post it in the "Authenticate This" thread for opinions.